Matrix for determining cuts on pattern cams



May 14, 1963 A. S. HAGGAR MATRIX FOR DETERMINING CUTS ON PATTERN CAMSFiled NOV. 10, 1960 W32 4 /6 2 0 30 I i if 227; o n l// .2

l 52 1g :Y 14 I 6 I N VEN TOR. AL/WEO 5. #4664? A 7511 474 MW UnitedStates 3,089,248 MATRIX FOR DETERMINING CUTS ON PATTERN CAMS Alfred S.Haggai", Paterson, NJ. (57 Mandate Drive, Wayne, NJ.) Filed Nov. 10,1960, Ser. No. 68,465 13 (llaims. (til. 33-1'74-) This invention relatesto improved pattern cams for Warp knitting machines, such as Raschelmachines, and, more particularly to a matrix for preparing improvedpattern cams for actuating the warp guide bars.

The present invention is concerned primarily with warp knitting machinesof the type which generally comprise a pair of end frames supporting oneor more needle bars and one or more horizontal warp guide bars. As wellknown, the needle bars are arranged for upward and downward movementwhich is effected by suitable cams and linkage. The guide bars arearranged for forward and backward rocking motion whereby the guides aremoved to and fro between the needles, this motion being effected by acam and linkage which while forming no part of this invention serve toimpart motion to the guide bar. It is also well known that the guidebars are arranged for endwise patterning motion thereby enabling theguides to move longitudinally with respect to the needles, the lattermotion being effected by a pattern cam chain formed of individual chainlinks.

The motion of the needle bar and the motions of the guide bar are timedso that, when the needles move upwardly towards the guides, the guidesswing rearwardly through the needles. Because of the shape of the camrequired for effecting rocking movement of the guides, the guides movemost rapidly just before and after they have reached their rearmostposition and remain at their rearmost position only momentarily. Whilein this position the guides are moved transversely with respect to theneedles, either towards the left or the right. In order to effect suchlongitudinal movement while the rocking motion of the guides momentarilyhas ceased, the guide bar must be moved very rapidly. Since the camcontour of the pattern cam is utilized to effect such longitudinalmovement, the rapidity of the movement is limited by the permissiblechange of such cam contour. Each guide bar is moved longitudinallyindividually by its own pattern cam.

The present invention is primarily concerned with a matrix for producingimproved pattern cams of the chainlink type for efiecting thelongitudinal movement of the guide hat.

During the knitting operation or cycle, each guide bar receives twokinds of actions or motions. One kind of action or motion is necessaryto carry the threads back and forth between the needles, and this motionis known as laying-in motion; and, the other kind of action or motion isan endwise patterning motion occurring when the thread guides are infront and to the rear of the needles, and this motion which is effectiveto lap the threads around is known as knitting. motion.

The chains which are composed of the pattern cams are not concerned witha knitting operation but are solely concerned with a laying-in operationor locking-in work. During knitting, the patterning cams are drivencontinuously by suitable means geared to the driving mechanism of thewarp knitting machine. The patterning cams are composed of a largenumber of individual links which are coupled together by suitable pinsor pintles. The patterning cams control the motion of the guide bar soas to permit yarn to be laid across the needles for laying-in and toprovide a pattern in the fabric after which a knit- 3 ,689,248? PatentedMay 14, 1963 ice ting action takes place and holds the laid-in threadsin place to produce patterned knitted cloth.

The chain links which act as cam surfaces effect the desired endwisemovement of the guide Ibars during the knitting cycle, and the camsurfaces of the chain links vary in height to place the guide bars inseveral positions. In the normal operation of the Raschel machines, thechain links are provided with one surface having an increasing heightand when the guide bars are moved on the inclined surface, the operationof laying-in yarn occurs. The chain links then have a surface ofsubstantially fixed or constant height curved to the contour of a drumon which the links are positioned for maintaining the guide bars in apre-set position in accordance with the substantially fixed or constantheight; the dwell or pre-set portion which has a substantially fixed orconstant height may also be considered to be a top substantially flatcurved surface which is the highest part of each chain link and whilethe guide bar cooperates with this surface, the knitting motion oraction takes place. The other end of the link may be provided with adecreasing or sloping cam surface so as to provide an abrupt end facewhich permits a return spring to move the guide bars rapidly in anopposite direction to commence the next cycle and engage the increasingsurface of the next chain link. In some cases, the other end of the linkmay be straight and not provided with a sloping cam surface dependingupon the height of the next cam which is determined by the number ofneedle jumps. The next following cam may be the same height, lower orhigher. The important point is that there must 'be a smooth transitionfrom one cam to the next following cam to effect the desired laying-inof yarn in accordance with the pat tern to be made.

As is well known in warp knitting machines, a considerable quantity ofthe chain links must be used which are hand out or hand fabricated in acut-and-dry fashion or manner in order to obtain various designs orpatterns in the knitted goods. Each chain link now used generallyincludes a tongue portion and a groove portion together with anintermediate portion joining the tongue portion to the groove portion.When a complete chain is made composed of the individual chain links, itis evident that the tongue of one link is in mating or tongue and grooverelationship both with the prior and the next link so that the tongueportion of each link and groove portion of each link must always extendin the same direction. As mentioned heretofore, each alternate link mayhave one surface of increasing height, one surface of decreasing heightand an intermediate portion which is known as the dwell portion. Theother alternate links also have the dwell portions and two otherportions which cooperate with the surfaces of increasing and decreasingheight of the first-mentioned links. The portions of increasing anddecreasing height are hand cut in accordance with the particular designor pattern to be knitted. The increasing portion determines the extentof lateral movement of the guide bar in a first or forward direction tocontrol the position at which the guide enters between two needles toperform the laying-in operation. It will be evident that the slope ofincreasing portion varies in accordance with the position of the pointat which the guide is to effect the knitting operation. Also, in anyparticular design or pattern the first portion of the links will vary.The slope of the decreasing portion will also vary in accordance with asecond lateral movement required of the guide bar in a second or returndirection and the slope of the increasing portion which depends upon thedwell portion of the next link. As mentioned heretofore, a furthervariable is the height of the intermediate dwell portion of each link.Consequently, it will be noted that each link has three variables and itis usually difiicult to reuse all of the links of the chain once it hasbeen dis mantled. I

When using the Raschel warp knitting machines, there are many instanceswhen it becomes necessary to change the pattern or design of the knittedmaterial to be manufactured. One of the fixed costs in connection withthe manufacture of knitted material is the time element in preparing andthe cost of purchasing new links having the desired cam surfaces toprovide the new pattern or design.

It will be evident that one of the problems in connection with thepreparation of the cam chain is in connection with the cutting of thevarious links. Heretofore, this was a problem of considerable difiicultyand in many instances involved trial and error. Previously, because ofthe various haphazard cuts which were made on the links, as will bedescribed infra, it was usually difficult to reuse links from a previouspattern cam chain. Furthermore, when attempting to resue a link from aprevious chain, further cuts were made whether necessary or not to lowerthe height of the tongue and groove.

In order to overcome the foregoing difiiculties and problems in theprior art, the present invention proposes to provide a matrix plate, bymeans of which the cuts for adjacent links can be readily ascertainedand thereby eliminate any guess work.

' Another important factor is the point at which the cam followercommences to climb on the tongue portion of the link for the laying-inof the yarn. The cam follower or ball must hit the low link and be clearof the part which is ground on the high link. In this respect, the ballor cam follower might hit the high link before the low link and thenstart to climb, and such climb would take place too early. If the climbtakes place too early the step of laying-in yarn is commenced too early.With the present invention, the exact point of the climb is determinedfrom the matrix plate. It will therefore be evident that it isunimportant whether the groove portion or the tongue portion of twoadjacent links are not matched; the important point is that thecommencement of the climb take place at the proper time interval.Another feature of the invention is that the ball or cam follower mustalways hit the last point at which a knitting action is to take place.Accordingly, it is therefore possible to ascertain with accuracy theexact length of the fiat curved portion or dwell portion of the link.Heretofore, this was only determinable by means of trial and error. Themachine surface of the link is the flat curved portion or dwell portionduring which the knitting action takes place.

It is therefore an object of the present invention to provide a patterncam for warp knitting machines and the like which is not subject to theforegoing difficulties and disadvantages.

Another object is to provide a chain link having a cam surf-ace thereonwith a greater degree of interchangeability.

A further object is to provide an improved chain link which can be usedwith either new warp knitting machines or existing warp knittingmachines of various types.

Another object is to reduce the idle time required to prepare a new camchain for warp knitting machines.

Yet a further object of the present invention is to provided an improvedmethod of simply and cutting each link of the cam chain.

Yet another object of the present invention is the provision of animproved cam chain link which is of simple design and construction,economical to manufacture and highly eflicient in the accomplishment ofits intended purpose.

In accordance with the present invention, the foregoing objects areaccomplished by providing a matrix to deter mine with extreme accuracythe portion of the link to be cut so that the first cut made on the camlink is satis- 4 factory. Furthermore, it is not necessary to efiect anyfurther cuts on any of the links after the cam chain is placed onto thedrum of the warp-knitting machines. A further feature of the presentinvention is the method of simply and accurately cutting links inaccordance with the needle jumps to be made by the guide bar.

The objects, advantages and nature of the invention Will be more fullyunderstood from the following description of the preferred embodimentsof the invention, shown, by way of example in the accompanying drawing,in which:

FIG. 1 is a perspective view of the matrix plate.

FIG. 2 is a plan view of the matrix plate with the links shown inposition prior to cutting thereof to ascertain the exact point of riseor laying-in of yarn, and

FIG. 3 is a plan view of the matrix plate with the links shown inposition subsequent to cutting thereof indicating the manner in whicheach cam links forms a continuous cam surface with an immediatelyadjacent cam link.

Referring now more particularly to the drawings which illustrate thebest modes now contemplated for carrying out the invention, FIG. 1indicates a matrix plate 1!), preferably having two angularly disposedgrooves 12 and 1d, the matter of ascertaining the exact geometricrelationship of these grooves will be explained hereinafter. A centerline 16 is first drawn or inscribed on the plate, and the plate willinclude this center line as a reference line. In this respect, it isimportant to note that the drum carrying the links to position them forengaging the guide bar has a diameter such that 16 links form a completechain thereby indicating that each link occupies 22 /2 on the arc of thecircle of the drum. On plate MB on a flat face surface 34 thereof twolines are scribed which are spaced six angular degrees from line 16 andthese are designated 18 and 26*. Lines 18 and 20 also are projections ofthe radii of the circle of the drum carrying the cam chain and arespaced 6 from the line 16 which is a projection also of a radius of thecam link carrying drum (not shown). Between lines 18 and 2% there is atwelve degree arc, and this arc indicates the machine surface or dwellportion of a link which is placed on studs or pins 22 and 24. Pins 22and 24 fit within apertures in the links which are provided for couplingadjacent links together by pins or pintles.

Plate it? is shown as provided with grooves 12 and 14 for a purpose tobe described ftu'ther hereinafter. Inscribed within grooves 12 and 14are lines 3% and 32, respectively; when grooves 12 and 14 are notprovided and plate It) having a continuous flat face surface 34- isprovided, then lines 3t) and 32 are also inscribed on the fiat facesurface in a manner similar to lines 18 and 20. Line 30 is spaced 22 /2from line 18 and line 32 is spaced 22% from line 2 .9 and formprojections of radii of the circle of the drum carrying the links. Plate10 is lso provided with two additional pins 26 and 28. Pins 22, 2. 26and 28 form an arc of a circle when connected; the last-mentioned circleis concentric with the circle of the outer surface of the drum.

Referring now more particularly to FIGS. 2 and 3 f the drawing, plateSill may carry three links A, B and C which are positioned to simulatetheir position on the drum of the knitting machine (not shown) on pins22 and 24 for the center link B, pins 24 and 2-8 for the right link Aand pins 26 and 22. for the left link C. Link A is the link immediatelyfollowing link B and link C is the link immediately preceding link Bwhich are placed onto the plate it) in the exact manner and order inwhich they rest on the outer periphery of the cam carrying drum. It willbe evident that the order could be reversed so long as the order of thelinks is maintained in the same order as on the drum.

It is therefore possible with plate 14? of FIG. 1 to determine withaccuracy the point at which a cut is to take plate in order to ascertainwithout any guess Work or conjecture the exact point to cut the highlink 13 so as to meet the cam surfaces of links A and C to provide acontinuous cam surface.

Referring now more particularly to FIG. 2 of the draw ing whichillustrates plate lit with links A, B and C positioned on pins 22, 24,26 and 28 so as to locate links A, B and C in their exact relationship.-In addition, a ball 49 is provided when plate ltl is provided withgrooves 12 and 14 which is capable of sliding within grooves 12 and 14in order to locate center lines 30 and 32 with extreme accuracy. It willbe evident that when ball 40 makes a point contact with the top portionof link B, such point which is point of tangency for the top surface oflink B with ball 40, the exact point of intersection of the center lines30 and 32 are located. It will be noted that links A and C each has aheight which is less than the height of link B. When ball 40 contactsthe top surface of link B as shown in its position in groove 12, thepoint of contact when projected vertically will locate one point 42 inorder to commence the cutting operation on the tongue portion of link B.The other point 4-4 on link B to commence the cutting operation on thetongue portion is located by means of line 26 on plate 1%. The tongueportion of link B is cut from the top surface 54 thereof from the point44 to point 42 so as to remove a substantially triangularly-shaped orpie-shaped portion. In a similar manner, ball 40 may be placed intogroove 14 in order to ascertain the part of the groove portion of link Bwhich is to be cut so as to provide the proper transition from link C toB to form a continuous cam surface. Accordingly, the groove portion iscut from point 46 to point 48 with point 46 being located by means ofball 40 and point 48 being located by mean sof inscribed line 18.

When plate N is not provided with grooves 12 and 14, ball 49 may beomitted and inscribed lines 30 and 32 may be used to locate points 42and 46. Points 44 and 48 are located in the same manner as describedhere tofore when grooves 12 and 14 are provided. It will also be evidentthat even when grooves 12 and 14 are provided, lines 30 and 32 may beprojected onto link B to locate points of cut 42 and 46. Link B may becut in such a manner so that the tail end of its tongue and grooveportions are beneath the top surface 52 and 54 of links A and C,respectively, and the cut takes place between line 28 and the projectionof the normal defined by line 3% to the line of tangency with link A andbetween line 18 and the projection of the normal defined by line 32 tothe line of tangency with link C. So long as the tongue portion of linkB is out below the groove portion end of link A and the groove portionof link B is out below the tongue portion of link C, the mating portionswill be satisfied. While link B may be out below the top surface 52 and54 of links A and C, it may also be cut to the top surfaces 52 and 54surface with links A and C. In many instances, ball 40 will contact theedge of the tongue or groove portion of link B so that there will be nopoint of tangency as such. In this particular instance, ball or cylinder40 may be used to locate the center line on links A and C directly bymeans of the point of tangency therewith, and link B is cut from lines18 and to lines 32 and 30, respectively, so that ball 40 will be normalto the side of the cut portion.

Referring now more particularly to FIG. 3 which illustrates links A, Band C with link B cut to provide a continuous cam surface, it will benoted that ball 40* is shown in groove 14 with the groove end of link Bcut to point 46 which coincides with the top surface 54 of link C. Inthis position ball 4! is tangent to the top portion 54 of link C and tothe descending surface 56 of link B so that there is no abrupt change inthe height of the cam surface from link C to link B. For link A, it willbe noted that the top surface 52 thereof is higher than point 42, andthe tongue portion of link B with descending surface 58 may beconsidered to have been undercut. When the tongue portion of link B isundercut in this manner as shown by means of edge or point of cut 42 toleave surface 58, the cam follower on the guide bar of the Raschelmachines will not jump or have any lost-motion imparted thereto after ithas made contact with the top portion or surface 52 of link A and justprior to the point of commencement of its contact with surface 58 on thetongue portion of link B. In a similar manner, if surface 56 wereundercut so that point 46 were below top portion 54 of link C, therewould be no jumping or lost-motion imparted to the guide bar.

Heretofore, both sides of the links were not cut in the same manner. Itis now possible to cut the links in the same manner since the exactpoint of rise and the exact point of fall are accurately determinablewithout guesswork. Once the dwell portion between lines 18 and 20 duringwhich knitting action takes place, i.e. the portion during which theneedles carry the yarn is accurately determined for each link, theknitting action is also accurately determined. With plate 10 theknitting action takes place as mentioned heretofore between lines 18 to20*,

that is along the top curved machine surface of the link.

If for example, the groove portion of link A were lower than the tongueportion of link B, the cylinder 40 which represents the cam follower ofthe guide bar might hit the high portion on the tongue of link B therebycausing a lost motion to be imparted to the guide bar so that the guidebar will be delayed and prevailed from proceeding in its normal manner.If this happens, then the cylinder cam follower would start to climb,i.e. the cam follower for the guide bar would start to climb too soon.After completion of a knitting action for link A which should occur whencylinder 40 defines and locates the center line 30 to define the end ofthe dwell portion for link A.

For the sake of further explanation, let it be assumed that cylinder 40engages the top portion 52 of link A but does not engage the top portion58 of the tongue portion of link B, then there is no necessity to cutlink B. A further requirement is that the cylinder 40, while being slidalong the groove 12 so as to be placed into contact with top portion 52,does not at any point hit the side of the tongue portion of link B priorto contacting top portion 52. If the cylinder 49 at any time contactsthe side portion 58 of the tongue portion of link B it must be a smoothcontact without any raising or removing of the cylinder 40 from the topsurface portion 52 of link A. Consequently, if link A has a height tothe top surface 52 for a six needle jump and link B has a height for an18 cam or 9 needle jump with the tongue portion thereof cut down to an8, 6 or 4 cam or 4, 3 or 2 needle jump, such link may be used with linkA. The plate 10 is also effective to indicate when the cut on the tongueportion of link B can be used with a particular link A.

Referring again to FIG. 2, and particularly link B which is shown uncut,for the purpose of explanation, it will be noted that there is a portionof the link which was cut previously. The top surface 50 of link B maybe arcuate and uniformly curved in a manner similar to links A and C orpartially cut as shown. When link B is partially cut as shown on thetongue portion thereof, it is believed to be evident that this link wascut previously to match with another link. If desired, link B can againhave its tongue portion cut to be matched with another link having asmaller number of needle jumps. The groove portion of link B is shownwithout any previous cut, and it will be evident that if no previous outwere made on the tongue portion then the tongue portion would bearcuately continuous with the groove portion. Accordingly, the matrixplate 10 is usuable to effect further cuts on links which werepreviously cut for a different pattern.

While link B is cut between points 44 and 4-2, and 48 and 46 with point42 showing an under cut point and point 46 showing a point of tangencybetween sloping surface 56 and top surface 54, both the tongue andgroove portions of link B may be under cut or out to the topsurfaces 52.and 54 of links A and C, respectively. Taking the groove portion of linkB, lines 18 and 32 may be used to determine the two points on grooveportion of link B which are to be used to ascertain the line of cut. Inthis. manner, surfaces 54- and 56 will form a continuous cam; surfacewith the surface 56 merging smoothly into surface 54 as will be seenfrom FIG. 3.

Link B is related to link C, the next following link, in the same manneras described heretofore in connection With the relationship of link B tolink A.

It is important to appreciate that if the ball or cylinder 40 hits thelower link and does not contact the tongue or groove portion of thehigher link, there is no need to cut the link. If the ball in someinstance should hit the tongue or groove portion of link B, then it isnecessary to cut the tongue or groove portion so that there will be acontinuous cam follower movement of the guide bar to link C from link Bor from link A to link B.

The present invention finds its greatest applicability in forming thetongue and groove cuts of high links where the needle must make morethan 14 canr unit jumps or 7 needle jumps. Previously, it was necessaryto cut from one link to the next link. Now, with the present invention,it is possible to out without going to the next link and out deeper thanthe top of the next link. The only criteria is that the surface from onelink to the next link must be continuously smooth surface since thepattern cam chain acts as a cam which is its primary purpose.

It will also be evident, as mentioned heretofore, that a line which is aprojection of a radius of the cylinder carrying the cam links andlocated in the grooves 12 and 14 may be used or the cylinder 4%) may beused to locate the exact spot of the beginning of the travel of theguide bar to the next laying-in point between 2 needles. The guide bartravels on the tongue and/ or groove portion of the link and theknitting action occurs between the tongue and groove portion or dwellportion on the top portion of link B and of similar dwell portions onlinks A and C.

While there has been described what is at present considered to be thepreferred embodiment of this invention, it will be obvious to thoseskilled in the art that various changes and modifications may be madetherein without departing from the scope of the invention.

It will be evident that other means may be used to locate the projectionof lines 3d and 32 on the tongue and groove portions of link B. Forexample a template may be used on top of plate lit to extend theprojection of lines and 32 on link B.

What is claimed is:

l. A matrix plate for preparing cam links of a pattern cam chaincomprising, a plate, said plate including at least three studs, saidlinks being provided with openings for receiving said studs, one of saidstuds projecting through an opening in each of said links and meansassociated with said plate to indicate a beginning and a termination ofa dwell .portion on one of said links, said means including inscribedlines on said plate forming projections of a radii of a circle spaced 12degrees from each other.

2. A matrix plate as claimed in claim 1, including an additional lineforming a projection of another radius of the circle to indicate thetermination of the dwell portion of said other link, said additionalline being spaced 22 /2 degrees from the line indicating the terminationof the dwell portion of said first link.

3. A matrix for use in preparing cam links of a pattern cam chain forknitting machines having a pattern cam chain drum of an outercircumference forming a drum circle and adapted to support sixteen linksthereabout, each link having a dwell portion of twelve degrees, and eachalternate link has a first portion and a second portion which forms acontinuous cam surface with the dwell portion of each adjacent link,said matrix comp-rising a plate, at least three pins normally disposedon said plate and spaced on an arc of a circle which is concentric withthe drum circle, at least two links having apertures therein forengagement with said pins, first and second lines inscribed on saidplate and forming projections of the radii of the drum circle, saidfirst and second lines being spaced 12 degrees from each other anddefining the dwell portion of one of said links, said first linelocating the beginning of the dwell portion and said second linedefining the termination of the dwell portion of one of said links, andmeans on said plate spaced 22 /2 degrees from said first line locatingthe beginning of the dwell portion of said other link.

4. A method of preparing cam chain links of a pattern knitting camchain, comprising the steps of positioning at least two adjacent linkson a matrix plate having means thereon to position the links inaccordance with their operative position, the matrix plate having meansthereon to indicate the beginning of the dwell portion of one link andthe termination of the dwell portion of the other link, and cutting oneof said links from the beginning of the dwell portion to a point on thetop surface of the other link.

5. A method of preparing cam chain links each having a dwell portion fora pattern knitting cam chain, comprising positioning two adjacent linkson a matrix plate for holding the links in operative relationshiprelative to each other, marking the beginning of the dwell portion onone of said links, marking the termination of the dwell portion on theother of said links and cutting one of said links between the marking onsaid two links to provide a continuous cm surface between the dwellportions of each of said links.

6'. A method as claimed in claim 5, including the step of providinginscribed lines on said matrix plate to indicate the beginning andtermination of the dwell portions of the links.

7. A method as claimed in claim 5, including the step of providing a camroller slidable relative to said matrix plate to indicate the beginningand termination of the dwell portions of said links.

8. A matrix plate for use in preparing cam links of a pattern cam chainfor warp knitting machines having a pattern drum, each of said linkshaving a tongue portion, a groove portion and an intermediate portionhaving a dwell surface, said matrix plate comprising a base elementhaving positioning pins projecting therefrom, said pins being located onan arc of a circle concentric with the arc of the circle of the patterndrum, first means associated with said base indicating the terminationand beginning of the dwell surface of one of said links, second meansassociated with said base element indicating the termination of thedwell surface of a second of said links and third means associated withsaid base element indicating the beginning of the dwell surface of athird of said links.

9. A matrix plate as claimed in claim 8, wherein said first, second andthird means includes means inscribed on said base and forming extensionsof radii of the drum circle.

10. A matrix plate as claimed in claim 8, in which said first meansincludes means inscribed on said base and forming extensions of radii ofthe drum circle, and said second and third means each includes achannel, a cam roller slidable within said channel and providing pointcontact with the dwell surfaces of said second and third links at thetermination and beginning of the dwell surfaces of said second and thirdlinks, respectively.

11. A matrix plate as claimed in claim 10, in which said cam roller hasa central point movable within said channel along an extension of theradii of the drum circle.

12. A matrix plate as claimed in claim 8 in which said first meansincludes inscribed lines positioned 12 degrees from each other and formradial projections of the radii of the drum circle.

13. A matrix plate as claimed in claim 8, in which 9 10 the first meansindicating the termination of the dwell References Cited in the file ofthis patent surface of said one link is spaced 22 /2 degrees from saidUNHED STATES PATENTS second means and indicating the beginning of thedwell s rface of said one link is spaced 22 /2 degq'ces from 1,697,081Page 1929 said third means, respectively, on projections of the radii 51,831,608 Reynold-s 1931 of the drum circle. 2,990,703 Bialostok July 4,1961

1. A MATRIX PLATE FOR PREPARING CAM LINKS OF A PATTERN CAM CHAINCOMPRISING, A PLATE, SAID PLATE INCLUDING AT LEAST THREE STUDS, SAIDLINKS BEING PROVIDED WITH OPENINGS FOR RECEIVING SAID STUDS, ONE OF SAIDSTUDS PROJECTING THROUGH AN OPENING IN EACH OF SAID LINKS AND MEANSASSOCIATED WITH SAID PLATE TO INDICATE A BEGINNING AND A TERMINATION OFA DWELL PORTION ON ONE OF SAID LINKS, SAID MEANS INCLUDING INSCRIBEDLINES ON SAID PLATE FORMING PROJECTINGS OF A RADII OF A CIRCLE SPACED12* FROM EACH OTHER.